Queens Grid

15×15 Queens Puzzles

989 boards at this size, each needing 15 queens: one per row, one per column, one per colour region, none touching. They run from 15 to 36 deductions.

At 15×15 the group-lock techniques stop being optional, and some boards need you to test a queen and follow the consequences before committing. Most Queens sites stop at 12×12.

15 queens left to place.

Tap once to rule a cell out, twice to place a queen. Right-click marks an exclusion directly. Arrow keys move between cells.

A 15x15 board split into 15 colour regions, needing 15 queens: one per row, one per column, one per region, none touching. Regions run from 1 to 46 cells.

By difficulty

How this board is solved

Solving this 15x15 board takes 15 deductions and needs only the basic deductions, drawing on 2 distinct techniques. The first queen you can place for certain is O2. The queens resolve in the order O2 → H7 → D9 → L11 → F12 → B14 → N6 → G10 → I1 → E15 → C3 → K4 → J8 → A5 → M13. Every step follows by logic, so you never have to guess.

Techniques this board needs

Full solution, step by step (15 deductions)
  1. Single-cell region essential

    Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at O2.

  2. Single-cell region essential

    Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at H7.

  3. Single-cell region essential

    Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at D9.

  4. Single-cell region essential

    Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at L11.

  5. Single-cell region essential

    Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at F12.

  6. Single-cell region essential

    Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at B14.

  7. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at N6.

  8. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at G10.

  9. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at I1.

  10. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at E15.

  11. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at C3.

  12. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at K4.

  13. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at J8.

  14. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at A5.

  15. Forced queen essential

    Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at M13.

Answer: queens at O2, H7, D9, L11, F12, B14, N6, G10, I1, E15, C3, K4, J8, A5, M13.